* Stubborn and obstinate: They refuse to change their mind or follow instructions, even when it's in their best interest.
* Difficult to deal with: They are often argumentative, uncooperative, and generally unpleasant to be around.
The phrase is considered highly offensive and should be avoided in most situations. It's important to remember that using such language can be hurtful and disrespectful.
Origin: The exact origin of the phrase is unclear, but it's likely related to the blue-bottle fly, which is known for its persistence and difficulty to get rid of.
Alternatives: There are many less offensive ways to describe someone who is stubborn or difficult, such as "headstrong," "unyielding," or "uncooperative."